I bought some stuff from this site (but only b/c didn't find them at any other site), some of the items were value for the money paid but some were bad quality. The biggest problem with iOffer is that it feels like there is no support team, no parents to this site. I tried contact them several times and never got response. Most of the sellers there (if not all) don't speak English and don't answer your questions. Also there is not enough details on every item and the whole procedure of buying is very clumsy.
I try buying from there as less as possible.